Type-writing machine.



W. A. DUBSON.

we wmnm; MACHINE. v APPLICATION F|LEU]UNE3,19I6- 1,247,240. l Patented Nov. 20,1917.

2 SHEETS-SHEET I.

y |NVENTOR= WITNESSES W. A. DOBSON.

TYPE WRITING MACHINE. V v APPLICATION FILED JUNE 3. 1916. I 1,247,240. I Patented Nov. 20, 1917.

2 SHEETS-SHEET 1.

Q: iii

iNvtrw-om 0;%VW%V B My TZ/ Y Y ATTOR EY.

wiLLIAM A. nonson, or wmnson; ooN'nEoTIoU'r. Ass l ti nioxp To nnpn rtivifflnfqfiffi WRITER COMPANY, OF NEW YDEiLN-F AFPRI RA IQK F n t V TYPE-WRITING MACHINE;

To all iuhoin may c 'q ncem:

Beit known that I, \VILLIAM A. DQBSQNJ a citizen of the United, states residing in .Windsor, in the county ofQHartford and State of conneetieut, have invented certain new and useful Improyements in Typeriting Machines, ofwhich' the following is a specification. M

This invention relates to meansfor holding work upon the platen of a typewriting machine, particularly a revoluble platen, certain features of the invention especially adapting it also for use with a platen that is shiftable to different case positions.

An object of the invention isto vprovidea serviceable Work-holding deviceyu hich is small, compact, inexpensive and reliable and readily adapted, to existing maehines more particularly those of the U11 derwood, type, for holding cards orother small Work pieces and enabling thenato be typewrittenclose to the topand bottom edges, as Well as their side edges. 1 t 1 In the patent to Lasar, 4 15 ,533, is disclosed a work-holding means comprising rolls mounted upon the machine frame and runninqupon the visible side of thefplaten, to rcll thereon as-the carriage moves in letter-feeding direction. These rollsrnay be arranged one on each side of the printing poin't, Said Lasar rol-ls lare arrangedisyith theirlaxes perpendicular to the platen axis,

so that they may roll, on the platen orayork; P e eree he a r e ;t z .1.end evees-P es d a e fis pl e 55a e be pe i f i h ld g-t W k-pi e -per: m e am ms rlate i e ft :lp in ing point, 3 the Work-piece being thus u lgept P n; r: ei e p n edi pen- Accordng toone feature of anv imention,

e o l p pe a er zovi i w t barrels which. are elongated to extenddown- Wardly a considerable distance below the printing Kline, and, the downwardly-extendme eo tiee efe s el may, ser eisa defi zte i a u e by w ich the ead l (edg of i b ee -e z it eadvae liheveed ifl i sii p a n-t ale1 e e m l we ifmn .siden tlieigl tee is with heerieties al ele we it is fi ala massed etnes a-th J Q -UF QAMr PlHQ f, fir wa s; ar 11. gate-refit ;ee f-, eee les pteiiela by I Specification of Letters Patent.

,WQQEI. hexr eaz enthused, b eause arm hich, a their lower nd el'p Patentecl l vov.

Ap p fi 9 e 6, i o-1.01,45 4.

feted ,odbracketsf on the usual type=bar .s eg

ment. Pressure of the rolls againshthe pla en a be e ed;i r-fiatspringsh in efiective position by restraining arms, which may be shiftable out-of operatiae' qiosition, to remove the pressure of the rolls agai11st the platen,

.The rolls may be located between the vWing" scales, whlch are usually mounted upomthe type-bar segment to hear at their upper edges against the front of the platenqalong the base of the printing line when the platen is in lower case position. The work holtling ends of the rollsextend aboveithe iup per edges of these scalesuand h old gtheliwojrh piece When the bottom. edge theneo, to the printing:linexarid1 has; been; rried pwardly beyond {Said scales, either ithe l e-space-ro tionf tthe p a or by shiftngthe platen to upper-case position. If

the platen, is now. returned to such position that the bottom edgeof theork-piece; ;is carried below the printing line,,sa1d;edg e w ll come down in front of the seales b t that portion of the card betweeathe; rolls will stillbeheld firmly against the platen, a;

so, thatthe card. cantalways be written upon,

even if the outlying side portionsthereoi stand in fr tqt th a e; n as he c ease Y d;;f Q ri h ea-K ein, or versa, the sideredge of thenardwil 'sl 0 hei n ne Q the un erly ng-Magm Jr? is that u n t e in s metement o he-flan tea a h op s e flowe ing-said? edge Wi l slip under the scale; i I

o rzt e; QF FhQldlDg? :FQHSWIH mopntedi to slide -11p and dorv'n: 01,11- its- 151.1 9.- portlng arm. Thisgfeature ris especiallyusefuel at: the ,easeeshiiting-operation, when the platen -riisesr-bod ly to bring a ldidferaat iset o yp si wiee- {r0 faciii aethis sliding,

adjacent the printing point without offering i th n atnegnglble.fieisistanee tp portion of an Underwood typeyvr-iting ma;- chine, with the present invention applied.

t eret -i ig. 2" is an elevation showing the workholding rOlls and their relation to theplaten when the latter is in upper-caseposition.

F i g: [3 is a: iewshowing a work-holding r911, ascetic-plate and associated parts, di'sconnected;

Fi'ggfl isa-sectiona'l elevation of the machine, Various pa'rts being'omitted.

Fig. 5 is-a section atthe line 55 on Fig. 6 is a view similar to Fig. 5, but 'with the Work-holding roll and platen in lowercase position.

'l llie revolubleplaten 10 is rotatably mounted in; a plat-en frame 11, shiftable to upper and lower-case positions on the car- Ifiage12,whicliruns'on front'and rear guideraiis13=a=nd 14". Typebars-15 are pivoted on a fulcrun'r'16' on a stationary type-bar segean; to swingnpWa-nil1y and rearwardly 'to -th'e ffonfi face of the'platen', to-cause the upper and lower-ease types 18' and' 19* to print at "thepla ten alongthe printing line ti-$5 Fig: 2. The type liarsare actuated by keys 20' on keylevers 21 fulcrurned at 22aknclf connected through bell-cranks 23 to thetype=barsr The platen is shiftable t0 upper=0ase position by means of shift keys 24: and- 25'; ful'orumed on therod 22 and having upstanding arms- 26' to actuate the platen shiftihg frame 2-7,comprising a rocks'iia-ft' 28 The'shift frame 2-7 also-comprises a? shiftrail'f il on which runs: a-roll 30 on the platen f-iii-IIiG-i When ashift: key is: depressed; the c'onnedtedariiiigti 'tliereoif swings tlhsliiftirtr'he' 27 atone 28 as axis; there- 'Hx: cai1$iilg the r-ail QQ-"to lift I the uree into ptisitibr-Pforthe uppercase, types 18-to print thereon. H Q

' Tlsse' 'cwrr-iag'e niay the dr'ii e'n in lett eFfeed direction by the 'usual'springdrnm (not sl-iown? the letterieen; 'inovenient's=- team led} By escep ement mechanism, comprising-earescapementiwlreel 31'- drivrn by 55 atn'iescapement pinion 32 Wli'icli' runs on= a wait es es;themarriage; rotatiqn of tlie esa emen'tutyheelfiiscontfolled'hy escapenler-rt t1 gees on {a dag r cker; pivoted} at .35

ana aenatea by-e muyeiserbar-eeg wiiiehfi's 69 unwed "rearward-1y;'atieacfltype stroke try a neala eaeteateiiwy e-tarq I The? piaaawnei hje rotated te 'line spaee 39 on which is mounted a pawl. 40, to drive alum-space ratchet wheel kt onthe platen axleandl thorefiy rotate the platen. The p aten may also be rotated in either direction by, the usual, hand-wheels. i2, secured to. the. ends of the platen. axle. Work-sheets may be i'ntroducedtb the machine by placingthem'en the paper-shelf 43 behind the platen and then rotating the latter to advance. the. sheets around the underside of the platen between the same and the rear andfi'ont' feed rolls 44 and 45, respectively, and upwardly past the printing line a.b..

The, mechanism. above described may he the same as-tha'tcommon-to the commercial Undrwood maichine.

For holding: cards, envelops, or other work-pieces, there are employed rolls 4:6 in front of the platen adjacent the printing point and held against the work-piece by spring-pressure, that the work is held closely against the platen at the printing point. These rolls lti'rnay be located on opposite sides of the usual center type-guide 47; the latter being mounted on the type-bar segment 17. The rolls bear upon the visible side ofthe'platen at or adjacent to the print- 1ng line,' with their axes perpendicular to the platen axis.

These'rollsor cardhold ers may be located Between the" inner ends of scale-platesor wings 4'8, the-upper edges 190f which Bear against the platen atthe'bass'of the printing liile'on-the'platen when the-latter ig-ih lowercase position and serve-a-sgages t'oindicatethe position of the printing line on the work-sheet, said, wings also havi'ngtlie usual scale markings atfletter-sp'ace intervals azlo-ngthe indicating edges 4.93 The wings 48 are monntedto swing on rods or pintles 50, each-hating; a screw-threaded portion 51 for connection with a" bracket 5'2rsecured by screws 53 to the type-liar segment. The wings are airra nged toswing-toward and from-the plat-en and are-normally held-with theii'edges 49 bearing-against theplaten or work-piece by means ofcoilfisprings 54.- T-hewings may be arms 56, which are pivoted; on thetpi'ntles 50 to*enatlle=said rolls toswing' toward and fromthe platen; More specifically, tli'fe mounting, of each, roll-carrying, arm. 56" is provided by -means offap'ii ot opening 5"? in the lowersquarediend 58ofthe am 56 said o ening; 5? receiving a reduced end" 59. er the *pihtl :56, said nd-tannin in a-ifecess B0, in, the bracket 55%," whereby-5 movement of sitia a'rm 01 tHe 1-611 45% a (in ction. lengthwesterns bitten-is recenteti. Esta-sen cease-ma ty names) 'a crew fifi-to "the squared end 58 of the rollcarry ng arm, the lower end of the spring normally bearingagainst-a holding block or arm 63, to hold the spring under tenslon. Each offs-aid bloeks 63 is mounted by a pivot sorewwfil 011* the segment-'17 to swing from the-normal horizontal position, in which it "u'nd erliesthelower endof the springtil and applies tension thereto,to the dotted-line positioin (-F igufl), in which the tension 1s removed. .The rolls46 may then swing freely away from: the-platen a limited distance, as may be desirable in manifolding or other work in which it is preferred not to use said rolls." w

'Inord'er that the card-holding rolls 46 maymove-freely over the work-piece when the "carriage moves in letter-feed direction, or in thelopposite direction, without pr0 ducing any drag on the work-piece or tendency to displaceit, anti-friction bearings are provided for the rolls. The mountmg of eachroll on its hearings is'also such that the roll'may move up and downyfreely on its supporting spindle 56 with the platen when the latter is shifted between upper and lowercase positions. The position of the roll relative to the work thus remains unchanged during the case-shifting movement-s, permitting such movements wlthout d1splacement or disarrangement of the workpiece;

i The: anti-friction bearings for the rells comprise upper and lower sets of bearing balls 65 and 66 between the hollow cylindrical sleeve or-roll 46 and the spindle or arm 56. The bearim balls are held'in a cage or spacer 67, whici surrounds the spindle or stem 56', and is permitted a limited up-ancldoWn' movement relative to both'the roll and itsslp'indle as said roll'moves up and down. The parts are shown in Fig. 6m their normal lower-case position, in which the roll 46is at its lowestpcsitiondetermined by the "inturne'd" flange 68"" at the flower end of *ithe -ro ll bearing against the shoulder provided by the squared end 580i the supporting armi To limitthe downward niovei'nent of thecagefiT, the arm 56*1SP10V5LC18C1 with a shoulder-69 onwhich said cage rests. As the "pla'tedis shifted from lower-ease to" upperieasepasitio n (Fig!- 5), the roll 46mo'ves upweirdly on tlie stem 56 rolling on the' b'earing s, which also roll jupw'ardly on said stem'i lto'the? Fi gxt position screw 70 "threaded into the upper hollow end-of the stern *56"1i1nits=*the upward movement of the cage 67, which, in turn, proviides a stop to "hmit'th'e upwarcl'movement Oft'he roll 46.

3' "the eard=holding rolls 416 GORIipIJ'SG the roll portions, which run upon "the platen, and the hall-containing: barre-1 portions, these ions being 'separated h the line The barrel portio s2 extend azeonsiderable distwnee heidw thep rintiug line and 'are tangent to the platen, and thereby may provide guides for the leading edge of a work-piece as said edge is advanced beyond the front platen normally held in operative position by "spring-pressed detent rolls 74:, which engage in a groove in the rod 73. This construction permits said fingers, with the rolls 71, to be swung rearwardly away from the platen, and also permits said rolls to be shifted lengthwiseof the platen to adjust them to a workpiece of any width or at any position lengthwise of the platen.

The rolls 46 hold the card or other work piece firmly against the platen at the printing point, and as they roll on the platen without substantial friction or drag, they have no tendency to displace the work, but, on the contrary, hold it firmly to the platen, and thus prevent anydispl'acement or shifting ofxthe work over the platen surface. The rolls are effective to hold the work not only during the travel. of the platen lengthwise, but "also during its case-shittin g movements. An important function of the rolls 46 is to hold the card or'work-piece securely while being iwritten upon close to its bottom margin, particularly where said writinginvolves case-shifting movements-of the platen, and behold the work firmly against the platen at the printing point when the bottom edge of the work-piece temporarily overlies a wing 48, as may sometimes occur. Thus, for example, as shown in Fig. 2, the card 75 has been carried upwand so that its bottom edge is Very close to the p'rintin g line. =This'view shows the platen in upper-case position and the dolls 46 moved upwardly with the platen anid work-piece.- I f now the platen is dropped to lowerease position, the lower edge of the card "55 may :enga e over the outersurface oflthe wings 4-8, ecause' the edges49ibear directly on the' platen. *The rolls 46*"heing between. theinner" upght Ledges 7 6 =ot'zsaidwings and the printing 'cen tr,' 1ai e 'effeetine -'to hold the card firm'ly against the -platen'atthe: printing "point; notwithstanding-i theg factthat the card beyond said' rolis mama suna -(11 a slight distance my: the wings. When the platenjis -=1iioved lengthwise, "to a etthenj side edge ef the workiede toward the printing centerg so asato pa ss beyond the underlying wing 48, said edge iwillwhe pressetl egdiinst the manat the adj-atel e sen, are eard fto will, when the platen is moved in the respacing operation, the work-piece is shifted relatively to the rolls 46, so that the rolls are positioned to bear on the work at the new printing line.

Variations may be resorted to Within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1.. In a typewriting machine, the combination with a platen having a case-shifting movement, of a work-pieoe-holder comprising an upright, pivoted, cylindrical roll, means to hold the roll with a yielding pressure against the work on the platen adjacent the printing point to roll on the work as the latter moves with the platen in letter feed direction, a stationary support on which the roll is mounted to shift endwise up and down with the work during the case-shifting movements of the platen without movement of the roll relative to the work, and means for holding said roll with a yielding pressure against the work.

2. In a typewriting machine, the combination with a carriage and a rotary platen shiftable thereon to upper and lower-case positions, of a work-piece-holder comprising an upright, cylindrical roll arranged adjacent the'printing' point to bear against a work-piece on the platen, and an arm on which said roll is mounted to rotate to permit the roll to run on the work during the travel of the carriage, said roll freely movable endwi'se on said arm in a direction to permit it to move with the platen and workpiece during the case shifting. movements of the platen, said arm having a stationary mounting.

3. In a typewritingmachine, the combination with a rotary platen and a typeebar support jrelatively shiftable to differentieasepositions,- said platen having a-letter-feed travel-in the direction of its length, of a Work-holding, PlVO-t-Bd, cylindrical roll arranged to bear against a work-pi'eeeon the platen and to roll on said work pieoe d-urin the travel of the platienin letter feeding direction, said rollmountedon said support for endwise bodilyshiftingmovementthereon in an up and down. direction to permit relative shifting of said roll and support during a ease-shifting movement while maintaining: a: substantially constant'rela 'til've P :$ii;tiQniQ{fith e roll and work-pieee-during snflhashifting.movement.

5 A. Inn typewiutiitgemaohinegithe eombiiieition with a' rotary platen shiftable to upper and lower-easepositions, of a stationary support, an arm extending upwardly in front of the platen and pivotally. mounted on said support to swing. toward and from the platen, a work-holding roll mounted on said arm to bear against awork-pieceon-t'he platen,-mans to press said arm toward the platen'to hold said roll with a.- yielding-pressure against the wo'rk-pieceon the platen, and anti-friction rolling bearings interposed between said-arm androll and arrangedto permit the roll to rotate freely on said bear-- ings and also to move freely up and down thereon relatively to said arm, whereby the roll may runon the-work-piece during. the movement of the platen in letter feeding di rection, and may also move up and down with the platen during a case-shifting movement, the work-piece being held firmly against the platen by the roll during such feeding and shifting of the work Without being dragged or displaced by said roll.

In afront-strike typewriting machine, the combination with a revoluble platen and types to print at the front face thereof, of pivoted, upright, cylindrical, worlel'iolding rolls infront of the platen and arranged to bear against a work-piece on the platen at the printing line, said rolls extending a substantial distance below the printing line and adjacent to the platen to form guides for the leading edge of a work-piece, arms on which said rolls are supported, a stationary supporton which said arms are mounted to swing toward and from the platen,-and springs to swing the arms toward the platen and hold said rolls against the work-piece on the platen, the'platen being shiftable up and down to upper and lower-case positions, said rolls arranged to move freely endwise up and down on their supporting arms during the case-shifting movement of the platen, whereby the positions of the rolls relative to. tl1e,work -'piece remain-substantially unchanged during a ease-shifting movement of; the platen.

6. In a typewritmg; machine, the combination with a rotary platen, of astationary support, scale-plates mounted toswing-on said support and having edges to bear against the platen adjacent the: printing line at each side of the printing point, and upright work-holding :roll's arranged; to

bear against the platen at the" printingliHG,

said rolls interposed between-the printing point and the ends 'ofsaidp'lates neareststhe vtheir inner ends spaced from sa'idprinting point, said wings eachehavinghan; edge ere tending-along; theipla-teh and bearing; against theaplatemafior' akiianerit ito the printing-lint, 0

printing point, and said inner ends of said wingsfor holdinga work-piece firmly against the plateiratthe printing point. 8 Inja typewriting machine, the combination with a rotary platen, of wingslocated ,on opposite sides of the printingpoint with their inner ends spaced fromsaidsprinting point, said wings each having. an edgev ex- 10 tending along theplaten and bearing against theplaten at or adjacent to the printing line, and work-holding rolls located between the printing. point and said. inner ends of said wings for holding a work-piece firmly against the platen at the printing point, the

platen being shiftable up and down relatively to the said wings to upperand lowercase positions, said rolls also shiftable up and down with the platen. 9. In a typewriting machine, the combination with a rotary platen shiftable up and down for printing in different case positions, of a stationary support, wings mounted on said support in front of the platen and extending upwardly therefrom, the upper edges of said wings extending along the printing line'on the platen when the atter is in lower-case position, swinging arms mounted on said support and extending upwardly in front of the platen between the inner ends of said wings and the printing point, work-holding rolls rotatable on said arms, and meansjto hold said rolls with a yielding pressure against the platen at the printing line, saidrolls mounted to move up and down on said arms to shift with the platen.

10. In a typewriting machine, the combination with a rotary platen shiftable up and down for printingin different case positions, of. a stationary support. wings mounted on c said support in front of the platen and extending upwardly therefrom, the upper edges of said wings extending. along rthe printing line on the platenwhen the latter is j in lowercase1 position, swinging arms mounted on said support and extending upwa-rdly in front of the platen between the inner ends of said wings and-Ethe printing point, work-holding rolls rotatable on said arms, and means to hold said rollswitha. yielding pressure against: the =platen'at the printing line, said rolls mounted ,tomofve up and down on said arms to shift with the substantial distance below the printing and forming means to guide a work-piece to the printing line as it is advanced around the platen.

11. In a typewriting machine, the combination with a rotary platen and a type-bar support, said platen and support relatively shiftable to difi'erent case positions, an upright, cylindrical roll providing a workas holding device mounted on said support and during the letter-feed movements ofQ the cardholder comprising a st tio a' 'v supn i r;

platem said rolls extending downwardliv a. f d

ine-twbeqaoved reely up and own arranged to bear against*a.--.work-pieceon?- the platen, and anti-frictionmeans rolling between said roll and said support duringa case-shifting movement, permitting the roll to move endwise tomaintain afixed position relative to the. work-piece during said case shifting movement. 7 V

12. I-na typewriting machine, the combination with a rotary platen shiftableto; difienentease positions, of an upright work holding roll, a support on which it is carried, means to hold the roll with a yielding pressure against a work-piece on the platen, said roll arranged to run on thework piece '80 platen, and anti-friction means between said r support and said roll permitting the roll both to rotate and ,to move endwise freely; relatively to said support during a caseshifting movement in such direction that-85,; the roll is carried up and down by the platen andits position on the work-piece maintained unchanged during the case-shifting movement. v

13. In a typewriting machine, the combination with arotatable platen, having a case-shifting movement, of a stationary .card-holder mounted on the machine and comprising support-ing means and roll .ro- 1 tatable thereon, said rolls positioned to, en gage a card or work-pieceandholdit onthefa; platen with, sufiicient. pressure toprevent. slipping ,ofthework-piece on thevplaten sup face during the rotation and letter-feed movements of the :platen whenpsaid work'- piece isheld on the platen solely by wsaid rolls, the latter having connection with their, supporting means, permitting them to roll' freely on the work-piece, during said letterfeed movements of the platen, and permitting the platen to move them freely on their supporting means without rotatiomasthe. platen, is shifted, to thereby maintain the relative position of the rolls and work-piano unchanged as the platen shifts. 11 0,

14. The combination with a, platen -shi\ft;. able to upper and lower; case-positions, of a and an upright-roll-zthereonv posit oned-it, bear againsta card or otherwork pieceon 11in; the platen. andfcausethe work-piece lo 1b moved with the :platenas the latter IS Shi-ft ed, and anti-friction beaning'ballsinterposed,g between the roll and its support, and arranged to permit thearollwhothito rotate and-1:120

by the platen during the case-shifting of the platen to maintain the relative position of the ro and work-piece unchanged.

15. The combination with a platen shiftable to upper and lower case positions, of card-holding means comprising arms pivoted on a stationary support to swing toward and from the platen, upright rolls mounted to rotate on said arms and posi- 13 0 bination with atrav'eli ng platen shift-ableto-"upper and lowercase positions, of a card- "hold'er comprising an upright r'oll positiojlred to bear against acard or otherworlrpiece on tlieplaten at the printing line 0n the platen, er-swinging support comprising a spindle on which said'roll is'mounted for rdta'ti0n' an'd for movement lengthwise relatively-to the spindle, and hearing balls interposedbetwe'en'the roll and the spindle ar'id arranged'to'run on the roll and spindle during said rotative and lengthwise move '25 merit of the roll;

17=.1n=a typewriting'nrachine, the combih'a tion with a 1 evol-1'1b'le' platen havinga letter-feed" travel in th'e -directionof its leng tli a'rrd shiftalb le'lup 'and do'wn to differnt -case positions; ofwi'ngs' locatedoii oppo site 'si'c'l-es' of the printingcenter, a stationary support on which said wings are pivoted;

springs" to? swingsaid' wings toward the platen aridcause their upper edges to' bear fi against the-p1ateir along-the printing line, worklidldiirig means arrangedto bear against a card or' other Work-piece on the platen; said means located between the printingf center and the inner ends of said wings anda'r'ra'nged toariot'e up a'n'd down with the platen and workpiece when the platen is shifted to di flere'nt case-positions, and means whereby; the" w0rk =ho1ding xneahs' is vcaused to -near against thewm'k pieeewith :suflicient 4% pressure to hold the woi lpieee-fromf mdv-- mg e' tne platene j I n a typewritin- 'mztchinestheveombi nati "with deem I 5V- wifigs rfit'i' dfon ai tatioirarysupportiwith thei apper edgeti *bea-l' ihg aigainst' the platen mew sh'iit'ta'ble relievesa) said wings whereby" the "printing'line is's'paced from said wings when the platen is in upper" case position, and card-holding devices positioned between theprinting point and the inner ends of said wings and arranged to bear against a workpiece onthe platen, said devices beingshif-table-up and down with the platen and Work-piece, whereby when the bottom edge of the work-piece is at or close to theprintingline and the platen is shifted upwardly and carries said edge beyond said wings and is then returned so that the workpiece overlies said'wings, the work-piece is held firmly against the platen at the printing point by said holding devices;

19. Ina typewriting machine, the combii'iation with a roller platen and a stationary support, of a worloholder comprising an arm mounted on said support to swing to Ward and. from the platen, a roll mounted on said arm, a leaf spring secured. to said arm and depending therefrom, and a tensioning device for said spring mounted on said support to engage-behind the spring and cause the'latter to hold said roll-with a yielding pressurea'gainst-the platen, said' tensioning device shiftableto release the spring and permit-the roll to swing freely away fromthe platen-i 20. In==a typewritinginachine, the coinbi nation with a roller platen and a type-bar support, of scale; plates, pintles by which said' plates a re pi votally mounted on said support to permit said' p'lates' to swing toward and from the platen, springs-t0 hold said plates against the laten with their upper edges extending a ong the printing line, work-holding devices, comprising arms mounted to swing on saidpintles', rollers carried by said arms, and springs to cause said rirllers'to' against the platen at the printing line, the platen being shiftabl'e rel atia ely' to said support and plates -to* upperand lbt'erkase pesitions; said rollers mountedto shift on" said arms :-with the platen and thereby maintain a fixed position relatively tothe work piece during a eaSe-shifting? mtir ement of th e= platen. 1 WIEL 1AM A. DOBS'QNF'. Witnesses: v

* 'capm ulfithh pdt eiimmakherofitahed'ior nvei-qentsteach, tbi addressing the-"Commisslii'ner of Batentsit Washington,mG.* 

